Why is there no evidence that osama bin laden died?

im really suspicious of osama bin laden's 'death'. first all of a sudden barack obama announces osama bin laden's death around the time when his popularity is waning, and the attention about his actual birth place. some say that this will make obama popular again and thats that. when saddam hussein died, he was captured live on tv hanging and the media were so quick to show the world, however with osama's death, it was announced he died randomly, buried at sea within 24 hours and DNA tests confirm 99.9% its osama. America made a huge mistake celebrating osama's death as this will anger Al Queda even more and may result in more terror attacks. there was a photo of hilary clinton and barack obama watching osama getting 'killed' but how do we know they are actually watching it? can we take their word for it?